1998670839520 has 288 divisors, whose sum is σ = 5076807321600. Its totient is φ = 743322258432.

The previous prime is 1998670839457. The next prime is 1998670839553. The reversal of 1998670839520 is 259380768991.

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 816782937 + ... + 816785383.

It is an arithmetic number, because the mean of its divisors is an integer number (17627803200).

Almost surely, 2^{1998670839520} is an apocalyptic number.

1998670839520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998670839520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2538403660800).

1998670839520 is an abundant number, since it is smaller than the sum of its proper divisors (3078136482080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998670839520 is a wasteful number, since it uses less digits than its factorization.

1998670839520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 67.

The spelling of 1998670839520 in words is "one trillion, nine hundred ninety-eight billion, six hundred seventy million, eight hundred thirty-nine thousand, five hundred twenty".